Fountain pen



March l. 1925. 1 531 soo J. J. LYNAGH FOUNTAIN PEN Filed March 8. 1924/////I//W/I//////////////////////////////////////// ATTORNEY PatentedMar. 31, 1925.

UNITED STATES rar-ENT oFFlcE. A

JOHN J. LYNAGI-I, OF ST. LOUS, MTSSO'URI, ASSTGNGR TO* EISENSTADTMANUFACTUR- ING COMPANY, OF ST. LOUIS, MTSSOURI, A CORPORATION OFMISSOURI.

FOUNTAIN PEN.

Application filed March 8, 1924. Serial No. 697,767.

To all whom t may concern:

Be it known that I, JOHN J. LYNAGH, a citizen of the United States ofAmerica, residing at the city of St. Louis, State of Missouri, UnitedStates of America, have invented a certain new and useful Fountain Pen,of which the followingl is such a full, clear, and exa-ct description,as will enable anyone skilled in the art to which it appertains to makeand use the same, reference being had to the accompanying drawings,forming part of this specication.

My invention relates to fountain pens of the self-filling type in whichthe ink reservoir is in the form of a resilient collapsible sack, andthe principal object of my invention is to provide improved mechanismfor collapsing the sack which has the advantages of simplicity ofconstruction, does not interfere with the return of the sack toitsnormal shape, and which collapses the sac-k A in such a manner as toexpel all of the air therefrom so that when the compression mechanism isreleased suflicient ink will be drawn in to completely fill the sack.The last mentioned feature will be recognized as a highly desirable onein that for a given desired quantity of ink the size of the sack, andconsequently the other dimensions of the pen, can be made considerablysmaller than if the compression mechanism fails to collapse the sack in`such amanner as to expel all of the air therefrom.

Another object of my invention is to so arrange the lever operatingthecompression mechanism that it cannot be caught and unintentionallyactuated when the pen is being put into the users pocket.

My improved fountain pen has other desirable operative andconstructional characteristics, as will appear from the followingdescription In the drawings, which illustrates an embodiment of myinvention, Figure 1 is an exterior View of the pen showing the cap inthe position in which itmay be placed when the pen is being used; Figure2 is a longitudinal sectional view; Figures 3 and 4; are top and sideviews of the portions of the compression mechanism contained withlinthebarrel of the pen, 'the parts being shown in the relative positionsthey occupy before being inserted; Figure 5 is a view similar to Figure2, vbut showing in dotted lines the position of theparts of thecompression mechanism when the ink sack is partially collapsed, and infull rlines the fully collapsed position; Figures 6 and 7 are side andbottom views ofthe manuallyl actuated lever which `formsa part of thecompression mechanism; and Figure 8 isa i sectional'view of the cap ofthe pen showing the manner of attaching the clip for holding the pen inthe `users pocket. f

The pen l is mounted in pen section 2, to which the collapsible inksack3 is attached. This ink sack may be made of rubber and the interiorofthe sack is in com.- munication with the pen throughan opening (notshown) in pen section 2. The pen section is provided with an extension,as shown, which closely fits the interior surface of the end of thecasing or f barrel 4f.

vThe mechanism for compressing the ink'v sack comprises a compressingmember 5, preferably in the form of a rigid metallic bar adapted tocontact with the ink sack throughout substantially its entire length.This presser bar 5 is attached at one end to a flat spring member 6, andthe forward end of this spring member is provided with an integralcollar 15 which, in the assembled pen, bears upon the interior surfaceof the barrel and forms they support for the spring 6, andconsequently'for 'the presser bar 5y secured thereto. embracestheextension of the `pen section and isthus securely held between-it'andthe barrel walls.

Figure 4 indicates the shape and relative i position'of the spring andpresserbar when Preferably the collar 15 words, the presser baralsoflies parallel to the pen barrel walls and closely'vadjacent to thespring throughout its length. It results therefore that the ratio of thenormal 'di-l'.

ameter of the ink sack to the interior diameter of the pen ybarrel maybe small without the compression mechanism interfering with the returnof the sach toits normal diameter after being compressed.

The presser bar is actuated by a lever 7 positioned 1n a longitdinalopeningv through the wall of the barrel and lcarried by a pivot pin 8 onthe barrel. it will be noted that the arm of the lever, which ismanually engageable, is between the pivot 'the sack at its rear end, theposition of the parts at a point intermediate closed and the fully openposition of the lever being' shown by" dotted lines in F ig-ur'e 5. Itwill therefore be apparent that with my improved compression mechanismthe complete collapse of the ink sack first occurs at the rear end ofthe sack and advances progressively toward the front end of the' sack asthe actuation of the lever is continued, the rear end' of the' sackacting' as a fulcr'um for the bar. Thus allvof the airis expelled fromthe sack, whereas if the presser bar maintained its position parallel tothe casing walls" during`v its compression actionv on the sack,v or atany' angle such that the walls of the sack' might be completelycol-lapsed at a point near the forward end of thev sach loe-- vfore thecompression of therear end was completed', a (greater or less quantityof air would be held .in the sack` causerof-tlie'saclr,walls are closedat a point ahead of any air, further motion of the -presserban eventhough it bring all the portions of the sack walls immediately under itclosely' together', would frequently ycause the confined' air merely tostretch the lateral portions of the sack rather than force' its waythrough a closed portion of the sack ahead of,l it.

Thelever 7 is provided' with frictionplugs 9 engaging.V with the wall ofthe slot inthe barrel to hold the lever in closed position. In thisposition the rear end of the lever does not cont-act with the spring'6", and even though the operator after filling the pen does not push thelever' into closed position, the rea-r end of the lever' will. vnotinterfere with the return' of the parts 5 and G to their normalposition, as shown in Figure 2, and therefore will not offer anyresistance to the fulll expansion ofthe sack and' consequentlyitscomplete filling with inlc The lever 7 is also provided with integrallugsl'lwhich prevent the lever from` being` :Inoveclf'-f11rtherbackward: than shown in Fifs'f'u-rew 5 when the pen section 'and' sackThis is true behave been removed for the application of.

a new sach, and thus prevent the user who does not understandtheinternal construc-y lects to press the lever to the closed pesi-- tionshown in Figure 2, and thus the accidental expelling of inli from thesach at this time is prevented."

As best shown in' Figure 8, the holdii'igclip ll' is formed with anextension adapted to pass through anv opening); in the wall`r of.

the cap and to` bear upon thevinner wallof the cap. It is held in thisposition by means of a sleeve l2, which is provided with a longitudinalslot in its periphery to receive the extension, and forms a press fitwith the interior bore of thel cap.

lt will he understood that when the pen is to be placed in the pocketthe cap is overv the forward end of the pen and the threaded portion 13of thel cap) engages the threaded portion le on the barrel to bring' theend of the sleeve l2 into air-'tight relationl with he forward end ofthe pen section 2.

Having"l fully described my invention, what I claim as'new and desire'tosecure by Letters Patent of the United States' is:

l. ln a fountain pen, the combination of a casing, a resilient inlrreservoir therein, mechani'si'n for compressing the ink reservoircomprising a spring supported at one end only and a presser bar beneaththe spring' having a free end and its other end secured to the free end:of the' spring, the point of attachment of spring and presser' bar beingadjacent the rear end" of the ink reservoir and the spring support beingad# jacent the forwardy end ofthe reservoir, and

means for applying pressure to the presser bar at such point as to causesaid bar to assume a position at such an angle tothe axis of thereservoir durii'ig its compression movement as to complete itscompression action on the rear end ofthe reservoir in advance `ofcompletion of compression of the forward portion thereof.

2. InL a fountain pen, the combination of a casing, a vresilient inkreservoir therein, Hat spring supported at one end within and near theforward end of the casing and normally lying parall'el with and adjacentto the casing wall, the rear end of said spring being yunsu'pport-ed?4`a presser bar having oneend secured to the nnsupported end' of thespring in such manner as to be normally' heidi by" the spring beneathand adjacent t0 said spring 'tlnnughout #its length, and means forapplying pressure to said spring and through it to the bar at a pointintermediate its ends.

In a fountain pen, the combination of a casing, a resilient inkreservoir therein, mechanism for compressing the ink reservoircomprising a spring member supported at one end only and a presser barbeneath the spring he ving a free end and its other end secured to thefree end of the'spring, and means for applying pressure to the springand through it to the presser bar at such point as to Cause thecompression of the rear end of the reservoir t0 be completed ieforecompletion of compression vof the forward portion of said reservoir.

4. In a fountain pen, the combination of a casing, a resilient inkreservoir therein, a flat spring supported at one end Within and nearthe forward end of the casing and normally lying parallel with andadjacent to the easing Wall, the rear end of said spring beingunsupported, a presser bark having one end secured to the unsupportedend of the spring in such manner as to be normally held by the springbeneath and adjacent to said spring throughout its length, and a pivotedlever mounted in the side Wall of the easing, said lever having almanually engageable end exterior of the casing and its piv-ot pointbetween said end and the rear end of the casing, the rear end` of saidlever being adapted to engage the upper surface of the spring to depressit and the presser bar, the area of operative en* gagement being solocated With respect to the ink reservoir that the rear end of saidreservoir will act as a fulcrum for the presser bar during the finalportion of the coinpression motion of said bar.

In testimony whereof, I have hereunto set my hand this the 1st day ofMarch, 1924.

JOHN J. LYNAGH.

